O'Brien says here that his mother died two years earlier, yet in TNG's "Family" - set four years ago - he said that he once found his father chasing a nurse around sickbay. So his father did this while his wife was still alive?

What exactly is the point of mounting the big deception here? The crew apparently know O'Brien is a fake before he even arrives on the station, right? So why not just stun him the minute he gets there and then stick him in a holding cell? Instead, they spend a whole day or so making everyone pretend that he's the real O'Brien, including faking up a makework job for him to do and locking him out of the security stuff around the peace talks. Hell, they even rope Molly in on this, having this tiny kid know that O'Brien isn't her real Daddy but pretend he is anyway! And all of that, to accomplish... what?

Plotline

Returning from a meeting with the Paradan government, Miles finds that everybody on the station is acting strangely toward him. Fearing a terrible conspiracy may have gripped the whole of Starfleet, he runs for his life with his former friends in close persuit.